By the end of 12th grade, students should have read D. 2 million words on their own.
<h3>What is reading?</h3>
It should be noted that reading simply means the process of taking in the meaning of letters or symbols.
It should be noted that reading is important to improve one's vocabulary and also understand a passage or story.
In this case, by the end of 12th grade, students should have read 2 million words on their own.
In conclusion, the correct option is D.
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